Portable electronic device with a graphical user interface



FIG. 1 is a front view of a first embodiment of a portable electronic device with a graphical user interface showing my new design; and,

FIG. 2 is a front view of a second embodiment of a portable electronic device with a graphical user interface showing my new design.

The appearance of the transitional image transitions between the images shown. No ornamental aspect are associated with the process or period in which one image transitions into another image.

The broken lines showing of a hand illustrates environment, and the remainder of the broken lines represent portions of the portable electronic device with a graphical user interface; the broken lines form no part of the claimed design. 

CLAIM I claim the ornamental design for a portable electronic device with a graphical user interface, as shown and described. 